package 锁.productAndConsumer;

/**
 * 线程间的通信问题:生产者和消费者的问题!  等待唤醒 通知唤醒
 * 线程交替执行  A B同时操作一个变量
 * A num+1
 * B num-1
 */
public class A {
    public static void main(String[] args) {
        Data data = new Data();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();
    }
}

//等待 业务 通知
class Data{//数字 资源类
    private int num = 0;
    public synchronized void increment() throws InterruptedException {
        while (num != 0){
            //等待
            this.wait();
        }
        num++;
        System.out.println(Thread.currentThread().getName()+">="+num);
        //通知其他线程,我加一完毕了
        this.notifyAll();
    }

    public synchronized void decrement() throws InterruptedException {
        while (num == 0){
            this.wait();
        }
        num--;
        System.out.println(Thread.currentThread().getName()+">="+num);
        //通知其他线程,我减一完毕
        this.notifyAll();
    }

}

